The only way we can reduce the amount of food we eat is to make sure we leave the table feeling on some level, satisfied. If not in quantity than in quality. So taste matters and it matters a lot. We have to eat the foods we love. Favorite foods could include a lot of healthy items that we may not buy because they are expensive or out of season or maybe we just don't think about them anymore because the junk food has taken over our taste buds. A few salted nuts can never stand up to the intense flavor of Doritos, Frito Lay is counting on that. Yet. if we stop buying the Doritos and keep a can of nuts on the pantry shelf instead, the next time the munchies hit we may find that those nuts hit the spot pretty well. Everyone loves something that is healthy. What is it for you? Strawberries? Popcorn? Avocados? Consider keeping those items around to tempt you into eating right.
If you love to eat something that is unhealthy then take it slow. Wean yourself off of it by offering yourself a healthier replacement of some kind. For example. we all drink a lot of soda pop these days. I loved soda too and drank it a lot. I consumed a lot of empty calories that way as I never could abide diet soda, the taste of those chemicals just made me sick. Soda just isn't good for you not matter what form it takes. I had to give it up. So, the first thing I did was to cut back on the amount of soda I drank. Then I invented substitutes like club soda mixed with fruit juice or even sweetened herb tea. Over time I stopped missing the soda. I sure don't miss the calories. I will still have a soda once in a great while but as a dessert treat only.
Find your favorite whole food and keep it in the kitchen. Treat yourself with it and it will keep the feeling of deprivation from your door. If it's a real food the damage to your body will be minimal. Worry about the calories later. The main thing is to get off the phony, high calorie, processed food. If you keep eating bananas or berries or sunflower seeds, the junk food might start to to taste...well, like junk.